Highway safety engineers build soft barriers so that cars hitting them will slow down at a safe rate. A person wearing a safety belt can withstand an acceleration of 300 m/s/s. How thick should barriers be to safely stop a car that hits the barriers at 76.86 km/h?

Answer:

What is Density? The density of material shows the denseness of that material in a specific given area. A material's density is defined as its mass per unit volume. Density is essentially a measurement of how tightly matter is packed together.

Explanation:

Answer:

 The density of material shows the denseness of that material in a specific given area. A material's density is defined as its mass per unit volume. Density is essentially a measurement of how tightly matter is packed together.

Like the Bullard balls on a pool table, gas particles are ubiquitous, so they are similar.

When two billiard balls collide the collision is nearly elastic. In an elastic collision the kinetic energy of the system is conserved before and after the collision. Therefore for simplicity, we can assume that the collision with the billiard ball is perfectly elastic. Momentum is conserved regardless of the type of impact. This means that the total momentum of all colliding objects before the collision is equal to the total momentum after the collision.

If you hit straight and the cue ball stops at impact the cue ball's momentum should all be eight This is because momentum is conserved Hitting diagonally keeps both balls moving after the collision. That is ball one exerts the same force on the ball two as ball two exerts on ball one This way momentum is conserved, so every time ball two gains momentum ball one loses This is Newton's third law.

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The resistance, given the data from the question is 2 Ω

Ohm's law states as follow:

V = IR

Where

With the above formula, we can obtain the resistance. Detail below

The following data were obtained from the question:

V = IR

Divide both sides by I

R = V / I

Resistance = Change in voltage / Change in current

Resistance = 6 / 3

Resistance = 2 Ω

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The measurement that represents the most accurate data set is second measurement (b. 72, 72, 70, 68, 68).

The average speed of each car in the given data set is calculated as follows;

v(avg) = (70 + 75 + 78 + 77 + 80) / 5

v(avg) = 76 km/h

v(avg) = (72 + 72 + 70 + 68 + 68) / 5

v(avg) = 70 km/h

v(avg) = (73 + 73 + 73 + 73 + 73) / 5

v(avg) = 73 km/h

v(avg) = (70 + 69 + 70 + 70 + 118) / 5

v(avg) = 79.4 km/h

Thus, the measurement that represents the most accurate data set is second measurement (b. 72, 72, 70, 68, 68).

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The volume has changed by a factor of 4/3

The volume a box will be the product of its length, width and height. The S.I unit is cubic meter (m³)

If the length of a box is reduced to one-third of its original value and the width and height are doubled, by what factor has the volume changed?

Initial volume = LBH

The new volume = L/3 × 2B × 2H

The new volume = 4/3 × LBH

Therefore, the volume has changed by a factor of 4/3

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A warning buoy is observed to rise every 4.3 s as crests of waves pass by it. The period of these waves is (T) = 4.3s

The period defines the quantity or the required time to complete one single oscillation. It has a synonym called time period. It can be measured in Seconds.

According to the question,

A warning buoy is observed to rise every 4.3 s as crests of waves pass by it.

According to the definition of time period, time between two consecutive peaks of the oscillation called the time period.

So, According to the question the period of these waves is (T) = 4.3s

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Divorce is viewed negatively by functionalists from a macro perspective. A functionalist would blame divorce on the breakdown of social structures rather than looking at the persons involved. Some of the structures that  have evolved over the years leading to the rise in divorce rates according to Functionalists is the increasing erosion of the traditional role of men and women in the society.

According to conflict theorists, divorce is the consequence of a disagreement over resources in a marriage.

Conflict theory holds that the disintegration of marriage occurs from rivalry for resources and authority within the marriage, just as it does in a society when groups compete for limited resources.

Choices, according to symbolic interactionists, are based on learnt behavior.

Symbolic interactionists believe divorce is the consequence of two persons affected by their friends and family members.

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velocity in meters/seconds if it takes 20 minutes is equal to 1.17m/s

the velocity of the object can be obtained by the formula v = distance travelled/ time taken

Total distance travelled = 1532 -125 = 1407 m and 20 min in sec = 20 X 60 = 1200 so velocity in m/s is 1407/1200 1.17m/s

swiftness; speed of movement or action; a fast wind's velocity. Mechanics. the speed at which a body's position changes over time in a given direction. the velocity of action or reaction; the rate at which something occurs

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When water is a gas following are its characteristics:

Like every other substance, water also exists in three forms on the basis of its physical state:

The properties of steam are similar to the properties of any gaseous substance. The particles in the gaseous state are farthest from each other than in any other state. The velocity of molecules is maximum in a gaseous state.

As the velocity of molecules is maximum, several collisions between the molecules take place every second and these collisions are perfectly elastic.

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Answer:

slowly decreases from left to right over the duration of the element.

Red hot is not as hot as blue hot because as the temperature increases the frequencies of light emitted becomes higher leading to emission of smaller wavelength lights.

All objects emits light, even at room temperature. But it cannot be seen with human eyes as the wavelength is too high. When heated the wavelength starts to decrease ( reaching the visible spectrum ) as high heat produce high frequency lights.

The wavelength of colour visible to human eyes starting from highest wavelength to lowest wavelength is as follows: Red, Orange, Yellow, Green, Cyan, Blue and violet.

Therefore, "Red hot" is not as hot as "blue hot"

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Possible experimental errors with the motion lab are making a math error, incorrect measuring, cars not let go at right time, did not follow directions.

The difference between two measurements is called an error.

The error in measurement is a mathematical way to show the uncertainty in the measurement.

Thus, possible experimental errors with the motion lab are making a math error, incorrect measuring, cars not let go at right time, did not follow directions.

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Answer:

Water

Explanation:

In scientific notation, the correct format is a x 10ᵇ, where an is an integer or decimal number whose absolute value is more than or equal to one and less than ten, or 1 ≤ |a| ≤ 10. In order for the scientific notation to be mathematically identical to the original number, b must be a power of 10.

For (a),

1 / 0.00032 = ( 1 / 32 × 10⁻⁵ )

1 / 0.00032 = 10⁵ / 32

1 / 0.00032 = 0.03125 × 10⁵

1 / 0.00032 = 3.125 × 10

(b) 10³ / 10⁻³

10³ / 10⁻³ = [ 10³ / (1 / 10³) ]

10³ / 10⁻³ = 10³ × 10³

10³ / 10⁻³ = 1 × 10⁶

(c) 10³ / 10³

10³ / 10³ = 10³ × 10⁻³

10³ / 10³ = 10⁰

10³ / 10³ = 1 × 10⁰

(d) 1/55000

1/55000 = 1 / (55 × 10³)

1/55000 = 0.01818 × 10⁻³

1/55000 = 1.818 × 10⁻⁵

(e) (10⁵)(10⁴)(10⁻⁴) / 10⁻²

(10⁵)(10⁴)(10⁻⁴) / 10⁻² = ( 10⁵ ⁺ ⁴ ⁻ ⁴ ) / 10⁻²

(10⁵)(10⁴)(10⁻⁴) / 10⁻² = ( 10⁵ ) / (1/10²)

(10⁵)(10⁴)(10⁻⁴) / 10⁻² = ( 10⁵) × (10²)

(10⁵)(10⁴)(10⁻⁴) / 10⁻² = 10⁵ ⁺ ²

(10⁵)(10⁴)(10⁻⁴) / 10⁻² = 1 × 10⁷

(f) 43.2 / (4.32 × 10⁻⁵ )

43.2 / (4.32 × 10⁻⁵ ) = 43.2 / (4.32 × 10 × 10⁻⁶ )

43.2 / (4.32 × 10⁻⁵ ) = 43.2 / (43.2 × 10⁻⁶ )

43.2 / (4.32 × 10⁻⁵ ) = 1 / 10⁻⁶

43.2 / (4.32 × 10⁻⁵ ) = 1 / (1/10⁶)

43.2 / (4.32 × 10⁻⁵ ) = 1 × 10⁶

(g) (4.32 × 10⁻⁵ ) / 432

(4.32 × 10⁻⁵ ) / 432 = ( 432 × 10⁻² × 10⁻⁵ ) / 432

(4.32 × 10⁻⁵ ) / 432 = ( 10⁻² × 10⁻⁵ )

(4.32 × 10⁻⁵ ) / 432 = 10⁻²⁻⁵

(4.32 × 10⁻⁵ ) / 432 = 10⁻⁷ = 1 × 10⁻⁷

(h) 1 / (10⁵)(10⁻⁶)

1 / (10⁵)(10⁻⁶) = 1 / ( 10⁵⁻⁶ )

1 / (10⁵)(10⁻⁶) = 1 / 10⁻¹

1 / (10⁵)(10⁻⁶) = 1 / ( 1/10)

1 / (10⁵)(10⁻⁶) = 10

1 / (10⁵)(10⁻⁶) = 1 × 10¹

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The distance of the bicyclist, travels with a constant speed is 38.4 meter.

Distance - It is the total path travelled.

Time - A period during which an action take place.

speed - It tells about how fast and slow an object moves.

describes distance covered in a given interval of time.

To calculate distance of a bicyclist covered we use

Distance = speed x time

               = 8.00m/s x 4.80s

               = 38.4m

The distance of the bicyclist, travels with a constant speed is 38.4 meter.

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y= 6.26 lb.

Check attached image 1.

Using the trigonometric functions, we need to find a function that relates the angle, opposite side and adjacent side of the drawn triangle. The function that does this is the tangent.

Let theta (θ) be the angle given by the problem.

Let "y" be the missing y component.

Tangent (θ) = Opposite side (y) / Adjacent side (x)

[tex]Tan(tetha)=\frac{y}{x}[/tex]

[tex]Tan(tetha)*x=y[/tex]

[tex]Tan(51.8)*(4.93)=y\\ \\y=6.26[/tex]

5. Express the result.

y= 6.26 lb.

The instantaneous velocity at 7s is 1.71 m/sec.

To know the velocity of the position difference,

Use the formula,

speed = distance / time

Given,

distance 1 = -4m

distance 2 = 8m

time = 7s

v = ?

Putting values,

v = Δs/Δt

v = d₂ - d₁ / t

v =  8 - (-4) / 7sec

v =  12m / 7sec

v =  1.71 m/sec

The velocity of a body or object determines the direction of motion. Speed is a scalar quantity in its most fundamental form. Velocity is essentially a vector quantity. It is rate of change in distance. The displacement change rate is the issue.

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The bag would move in the direction of the applied force.

What is the direction?

Recall that work is done when the force applied moves a distance in the direction of the force. In this case, we can see that the force was applied from the right. Do not also forget that the force applied must make the object to move in a given direction. The direction in which the acceleration is imparted must also be in the direction of the force.

The understanding of the impact of force on motion could be seen from the Newtons law. We know from the Newton’s law that an object would remain at rest or in  a state of uniform motion unless it I acted upon by an external force. This external force makes the object to move in the direction of the force.

Looking at the question, we are told that a 20 newtons is applied from the right hence, the bag would move in the direction of the applied force.

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Answer:

3эщ4шнп8х34нп943неп43щ

укр

Explanation:

кпк9геъ09ге

When energy moves through a medium (such as air, water, or any other liquid or solid matter), it creates a pattern of disruption that propagates away from the source of the sound.

Two identical loudspeakers separated by distance delta X each emit sound waves of wavelength lambda and amplitude A along the x-axis.

What is the minimum value of the ratio delta X/ wavelength for which the amplitude of their superposition is also A?

On a location along the X axis, we receive a portion of the difference in their attacks when we talk along the X axis. The attacks over the wavelength are equal to the phase difference, or delta. Lambda divided by pi. The square of the temperature tude of the first three waves plus the square of the second wave's temperature, B plus two times even a two times course delta, is what determines the amplitude following a superimposed wave. Okay. The resultant amplitude, A, equals the square root of a squared plus a squared plus two times a squared in this situation because the amplitude is tiny.

Delta is now, of course, square on both sides. And we discover that A squared equals two A squared plus cost. This widget's delta are is equivalent to -1/2. Delta will be seven Pi over six. Okay, so this value is delta, which is equal to X over lambda times two pi are the ratio assaults with lambda = 7/12 from equation one.

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in this experiment selected random people from various age groups and set a certain common rules of driving as judgmental rules and gave a call when they are in drive to check their skills.

When testing a theory, controlled conditions are crucial. When the independent variable in an experiment design is not changed or altered, this is known as a control condition. Because it maintains the driving circumstances uniform, a control condition is essential to this experiment's success in determining if smartphone use affects one's ability to drive. This would enable the only distinction between the test subjects to be the drivers' use of cell phones. Making ensuring the subjects are all travelling the same route and experiencing the same circumstances could serve as the controlled conditions for this experiment. This might be on a closed course where every subject has the same path. All individuals could use the same vehicle as additional controllers.

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Answer:

466 km/h

255°

measured anticlockwise from the east direction

Explanation:

find the resultant velocity of a plane after a crosswind affects its motion. take the positive

x -direction as east, and the positive y -direction as north. The components of the plane's velocity (without wind) are

And for the wind.

The components for the resultant velocity of the plane are given by

The magnitude of the resultant velocity is

[tex]\sqrt{(vx)^2+(vy)^2} =\sqrt{(-120lkm/h^2+(-450lkm/h)^2}[/tex]

= 466 km/h

Hope this helps u : )

According to the given statement the final speed is v = 25 m / s.

Velocity's rate of change with time, both in terms of speed and direction. A point or object going straight ahead is accelerated when it increases or decelerates. Even if the speed remains constant, motion on a circle increases because the direction is always shifting.

We utilise the relations and kinematics for this exercise.

The train accelerates in the first section from v0 = 7.0 m/s to 13 m/s in a time of t = 8.0 s.

v = v₀ + a t

a = [tex]\frac{v-v_o}{t}[/tex]

a = 13-7/8

a = 0.75 m / s²

Second part Accelerate again for t = 16 seconds

v = v₁ + a t

For this interval the initial velocity is v₁ = 13 m / s

v = 13 + 0.75  16

v = 25 m / s

According to the given statement the final speed is v = 25 m / s.

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.............................................

Answer: when the world ends

Explanation:

wild guess

The racer which accelerates at 50.0 m/s2 for 5 seconds then brakes at 60.0 m/s2 to a complete stop has an acceleration of  2 m/s^2, travels a distance of  100m in 5 seconds.

What is acceleration  ?

Acceleration is the measure of a change in velocity. Acceleration frequently, but not always, denotes a shift in speed. The direction of motion is changing, therefore an object travelling at a constant speed along a circular path is still going ahead.

Given:

Acceleration, a=?

Time, t =  5 seconds

Final velocity, v= 60.0 m/s2

Initial velocity, u=  50.0 m/s2

Therefore putting the formula,

v = u + at

=> 60 = 50 +5.a

therefore, a = 2 m/s^2

Therefore distance can be found by the formula,

x = u + 1/2 at^2

Where x is the distance.

=> x = 50 + 2 . 5^2

x = 100m

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The coefficient of kinetic friction between the box and the floor,  μ = 0.1 m/2.

To find out the coefficient of kinetic friction between the box and the floor we will the formula,

μ = F/N

where,

F is friction force

N is normal force

So by question given is mass and acceleration we have to calculate friction force,

So to find F we use,

F = ma

F = 10 x 0.75 m/2

F = 7.5 m/2

By using formula of coefficient of kinetic friction,

μ = F/N

μ = 7.5 / 75

μ = 0.1 m/2

The kinetic friction coefficient (F) is the ratio of the kinetic friction force (F) between both the surfaces in contact during motion to the normal force Ff/N. The static and kinetic coefficients of friction are both affected by the surfaces in contact. Their values are determined through experimentation.

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Answer: B. -10 m/s

Explanation:

Matter is the substance which have some mass and can occupy space is well.

Matter is any substance which has mass and occupy some space by having the volume. All physical things are made up of matter and an easily observed property of matter is its state or phase. There are three states of matter Solid, Liquid and Gas. These three matter are responsible for the production of things. The matter can occupy the space but the same matter can not occupy the same space.

The state of a substance directly depends on the balance between kinetic energy of the individual particles and the intermolecular forces between them. If forces are strong, state of matter changes into solid and liquid.

So we can conclude that matter is the substance which have some mass and can occupy space is well.

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